May, I. (1959). Collins italian gem dictionary. Italian-english, english italian. Collins Clear-Type Press.
Chicago-referens (17:e uppl.)May, Isopel. Collins Italian Gem Dictionary. Italian-english, English Italian. Gran Bretaña: Collins Clear-Type Press, 1959.
MLA-referens (9:e uppl.)May, Isopel. Collins Italian Gem Dictionary. Italian-english, English Italian. Collins Clear-Type Press, 1959.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.